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A. T. KOPPE f PHOTO COMPO S I NG MACHINE Filed Jan. 21,1925 8She-et-Sh'e-t a Patented Sept. 4, 1923.

UNITEDl STATES .PATENr OFFICE.

ALEXANDER T. KOPPE, F CHICAGO, ILLINOIS, ASSIGNOR T0 DIRECCIYTOPLATECORPO- RATION, 0F CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

PEOTD-COMPOSING MACHINE.

Application Vlled January This invention relates to photo-composingmachines adapted for use in making offset press plates and is animprovemeiiton the form of machine disclosed in my prior Patent No.1,510,007, granted September 30,

In the operation of a photo-composing machinevof the type disclosed inthe above mentioned patent, the subject to be reprol0 duced in asubsequent printing operation is transferred by photographic means fromy-a negative to a sensitized plate of zinc or the like, and a pluralityof impressions of the subject-matter of the negative are commonly l5reproduced on a single zinc plate of relatively large size so that it isnecessary, between successive exposures of the negative, to move.

the negative from one position to another over and above the surace ofthe zinc plate.

:20 -For this purpose, means are commonly provided or moving thenegative carrying Vframe toward and from the surface of the sensitizedplate, in combination with means for moving the negative carrying framelon- 5 gitudinally and transversely of the machine over the surface ofthe sensitized plate. The principal object of the present invention isto provide improved means for securing great accuracy in the positioningof the nega- 110 tive' carrying frame with respect to the surace of thesensitized plate. A further object of the invention is to provide meansfor adjusting the negative carrying frame over the sensitized plate incombination with additional means for eil'ecting a final preciseadjustment of the position of the negative. Still another object is toprovide means for moving the negative carrying frame upwardly from thesensitized plate in combination with additional means for holding thenegative carrying frame in its upper position after the lifting meanshas been withdrawn therefrom, in order that certain mechanismcooperating with said lifting means may be operated to effect l thefinal precise positioning of the negative carrying frame before thenegative carrying frame is lowered. toward the sensitized sheet. Afurther important object of the invention is to provide cam operatedmeans for effecting the elevation of the negative carrying frame awayfrom the sensitized sheet, in combination with electromagnetic means forindepend ent-ly holding the negative carrying frame in its elevatedposition after the vsupport pro- 21, 1925. Serial No. 3,788.

vided by the cam operated means has been withdrawn. Other objects relateto various features of constructionV and arrangement which will appearmore fully hereinafter.

The nature of the invention will be understood from the followingspecification taken with the accompanying drawings in which oneembodiment is illustrated. In the drawings, Fig. 1 shows a top plan viewof the improved photo-compo'sing machine; Fig. 2 shows a front elevationofthe machine; Fig. 3 shows a transverse vertical section taken on theline 3 3of Fig. 1; 4 shows an enlarged plan view of the negativecarrying frame and adjacent parts of the carriage structure by which thenegative is moved with respect to the zinc plate; Fig. 5 shows a de tailsectional view taken on the line 5 5 of Fig. 4; Fig. 6 shows anotherdetail sectional. View taken on the line 6 6 of F ig.' 4; Fig. 7 shows adetail sectional view taken on the line 7 7 of Fig. 4;'F ig. 8 is adetail vertical section taken on the line 8 8 of Fig. 7; Fig. 9 is adetail sectional view taken on the line 9 9 of Fig. 8; Fig. 10 is adetail section taken on the line 10 10 of Fig. 7; Fig. 11 shows ahorizontal sectional view taken on the line 11 11 of Fig. 10; Fig. 12shows a detail vertical sec- I tion taken on the line 12 12 of Fig. 11;Fig. 13 is a detail sectional view taken on thelline 13 13 of Fig. 11;Fig. 14 is a detail sectianal view taken on the line 14-14 of Fig. 11;Fig. 15 is adetail sectional view taken on the line 15 15 of Fig. 11;Fig. 16 is an enlarged vertical section taken on the line 16-16 of Fig.l; Fig. 17 shows an enlarged front elevation of the dial employed inconjunction with the mechanism for e'ecting aseating movement of thenegative supporting'carijiage with respect to the sensitized sheet; Fig.18 shows an enlarged detail section taken orf the line 18 18 of Fig. 16;Fig. 19 shows an enlarged and elevation of a portion of the machine,illustrating the mechanism of Fig. 16 by which the movements of thenegative supporting carriage are controlled and by which theelectro-magnetic holding means for the negative frame are con: trolled;Fig. 20 is a perspective view of the switch operating plate embodied inthe construction illustrated in Fig. 19; Fig. 21 shows an enlarged topplan view of one of the negative positioning blocks by'which thenegative frame is positioned transversely of the machine; Fig. 22 showsa side elevation of lio 5 i tudinal the mechanism illustrated in Fig.21, parts thereof being shown in section transversely of the machine;Fig. 23 shows a bottom plan View ofthe mechanism illustrated in Fig.`21; Fig. 24 shows' a detail sectional view taken on the line 24=24 ofFig. 1, showing the construction of one of the electro-magnetic-liftingdevices; Fig.' 25 'shows a front elevation of the electro-magneticdevice illustrated in Fig. 24; and Fig. 26 shows a diagrammatic viewofthe circuit connections of the electrof magnetic holding devices. y

As illustrated in the drawings, the machine comprises a frame 3() in theform of a rectangular structure having front and rear longiframevmembers 31 connected by transverse end frame -members 32. 'This frameis supported on legs 33 which may be connected by reinforcing members34. The frame carries a bedplate 35 which extends longitudinally betweenthe end framemembers 32 and has mounted thereon a flexible and slightlycompressible rubber sheet or I.blanket 36 adapted to form a support forthe sensitized zinc plate 37 on which the impression of the negative isreproduced by photographic means. The rubber blanket 36 is secured atone end 38 to the bedplate 35 and at the other side it extendsdownwardly over` the edge of the bedplate and is secured to a roller 40which is mounted in bearings carried by the frame members 32 and whichcarries a worm gear 41 adapted to be driven'by a worin 42 mounted on .ashaft 43 extending outwardyly through the front framemember 31 of themachine to be enga ed by a hand crank,\as shown in Fig. 3. T e operationof the hand crank on the shaft 43 serves to turn the roller 40 so thatthe rubber blanket 36v is tightened and caused to engageclosely theuppersurface of theV bedplate. One edge of the sensitized press plate 37 isclamped between a v clamping plate 45 and `a clamping plate 46 platesand engaging the upper which are mounted on a stationar bar 47 extendinthroughout the length o the ma-` chine. he plates 45 and 46 areconnected by screws 48 which may be tightened to cause the to grip theedge'of the blanket, and other screws 49 .passing through the plate 46surfaceof the plate 45 serve as fulcrums to 've a tilting action to theupper plate 46. he opposite edge of the sensitized press plate 37 isreceived and held by. a clamp 50 carried by `the adjustable block 51which'has asliding connection 52'.

with ,the edge of the bedplate 35, as shown in Fig. 3. Adjustingscrews53 engage the'slot or block 51 and cooperate wit-llil the edge of thebedplate 35 so that when t e screws are the sensitized sheet taut overthe surface of the rubber blanket. v

The. negative 55 bearing an impression .which is to be reproduced on thesensitized 5zinc plate 37, is mounted in a negative frame `they may be'tilted upwardl 56 in which it is held by clamping plates 57 andadjusting screws 58, as shown in Fig.. 4. The negative frame 5 6 is inturn carried by a vacuum frame 60 having an annular inwardly projectingflange 6l adapted to receive the overlying outwardly v extending flange'of the negative frame, as shown in Fig. 5. The negative frame ispositioned on the vacuum frame by means of pins 62 ex-V tending upwardlyfrom the flanges 61 and engagingapertures in the outer flanges of thenegatlve The under side of the vacuum frame 60 is frame on oppositesides thereof.

recessed upwardly around its outer edge as shown at 64 to receive anannular sealing ring 65 of rubber or other compressible material whichis securednin position against an inner air channel member 66 by meansofa plurality of metal clips 67 attached to the outer surface of thevacuum frame by screws 68, as shown in Fig. 6. When the vacuum frame 60is lowered, the lower sealing ring 65 engages the upper surface of thesensitized plate 37 to form an air-tight seal around the lateral edgesof the vacuum frame and the passage of air through the spaces around thenegative and around the negative frameis prevented by an upper-annularsealing ring 7 O of rec` tangular form which rests on the upper surfacesof the negative and vacuum frame, as

the air between the negative and the sensitized sheet is drawn into themember 66 through the vannular slot 66a thereof and exhausted through`the pipe 71, so that a vacuum is prosheet with the result that thenegative is forced by atmospheric pressure into close contact with thesensitized sheet, thus producing ion' ' duced between the negative andthe sensitized lul a close contact adapted for the reproduction oftheimpression of the negative on the sensi-` tiz'ed plate when the negativeis exposed toa suitable source of light, not shown,r mounted .above themachine.

In order that a vacuum may be obtained and exposures convenlently madewhen the vacuum frame 60 is projected beyond the edges of the bedplateat the front and rear sidesof the machine, auxiliary sealing plates j 75are provided, these plates being mounted on blocks 76 which-arejournaled in bearings carried by the end frame members 32 so that whendesired. The edges of the rubber blan zet 36 and of the sensitized plate37 are carried downwardly over the edges of* the bedplate and the inneredges of the sealing plates 75 are adapted to contact'with thedownwardly inclined portions of the sensitized sheet at the edge of thebedplate so that the u per surface of eachsealing plate 7 5 lies sustantially flush with the upper surface of the sensitized plate 37,thereby permitting the vacuum frame 60 to extend over the edge of thebedplate and the edge of the sensitized sheet without destroying thevacuum.

During the time that the negative is b'eing moved from one position toanother over the surface of the sensitized plate 37, the vacuum frame 60is supported in an elevated position out of contact with the sensitizedplate by a carriage 80 which is adapted to travel ,longitudinally of thebedplate carried by the frame 30. The carriage 80 comprises front andrear carriage frames 81 each consisting of a central carriage block 82and two side carriage blocks 83 which are connected by aplate 84. Theplate 84 of each carriage frame is pivotally connected tothe centralblock 82 by a pin 85 and each plate 84 is connected to each of the endcarriage blocks 83 by means of a bolt 86 engaging one of a plurality ofslots 87-which are provided in each end of the plate, and having a handnut 86a on the outer end thereof, as shown in Fig. 2, so that the spacedrelation of the carriage blocks 83 at each side of themachine may bevaried to accommodate the `carriage 80 to vacuum framesof dierentwidths. At the front and rear sides of the machine, the longitudinalframe members 31 are each provided with a longitudinal V-shaped groove88 forming a V-shap`ed rib 89 and another rib 90 having an inclinedsurface 91 which provides a trackway extendingy longitudinally of themachine to coact with the inclined face of a lug 92 formed on each ofthe middle carriage blocks 82 of the front and rearL carriage frames 81.A ilange93 extends downwardly on the front side of the trackway 91, as

shown in Fig. 10. The carriage blocks 83 are each provided with rollers93 and the V- shaped ribs 89 serve as the trackways adapted to coactwith the rollers 93 having grooved peripheral surfaces adapted toconform to the contour of the rib 89, as 'shown in Fig. 8. The front andrear carriage frames 81 are connected by transverse register bars 95having Athe form shown in Fig. 5. Each register bar 95 is slidablyengaged by a reglster block 96 having an undercut groove, engaged by theoverhanging -edge of the bar 95, and provided at the other side thereofwith an underlying plate 97 which projects beneath the bar 95. Eachregister block 96 carries a relatively' adjustable positioning block 98provided aldng its inner lower edge with an inwardly projecting flange98* adapted to underlie one of the outwardly projecting flanges whichare formed along opposite sides of the vacuum frame 60. The flange 98Elof one of the positioning blocks 98 is provided with an upwardlyextending pin 99 adapted to engage an aperture 100 which is formed intheHarige 60a of the vacuum frame, and at the other side of the vacuumframe,there are provided a pair of spaced lugs 101 on the upper surfaceofthe positioning block 98, adapted to receive between them a lug orlpin 102 which projects laterally from the adjacent edge of the vacuumframe. frame 60 is positioned definitely with respect to the positioningblocks 98 carried by the opposite carriage bars 95.

Each bar 95 is provided on its upper surface with a series ofgraduations 104'extending substantially throughout the length of the barand the positions of the register In this way, the vacuumv blocks areindicated by graduations or index marks 105 located on the uppersurfaces of' the register blocks 96, as shown in Fig. 21.

'springs 107a and are located in the recesses 108 above the plates Eachbar 95 is provided along the upper part of its outer edge with a seriesof teeth 109 adapted to be engaged by the detents 107 and, beneath therack teeth 109, each bar 95 has a smooth surface adapted to be engagedbyl rollers 110 which are mounted in brackets 111 arrangedv to be movedinwardly by leaf springs 112,

so that the register blocks 96 are maintained atall times in closeContact with the inner edges of the bars 95. The detents 107 are movedout of engagement-.with the teeth 109 of each bar 95 by means of a cam114 having formed in the surface thereof a notch 115 Vadapted to be engaed by the extremities 107b of the detents. Each cam 114 is mounted on apin 117 extending upwardly through the register. block 96 and havingkeyed on the upper end thereof an operating arm 118. The upper end ofeach pin 117 is threaded to be engaged by a locking member 119 so thatafter the arm 118 has been turned to move the cam 114 to the desiredposition, the locking member 11\9 may be operated to secure the cam inthat position. When the cam' 114 is rotated, the notch therein engagesone or the other of the detents 107. Two of the detents are provided sothat they may be moved into engagement with the teeth 109 alternately toengage alternate teeth corresponding to onesixteenth inch graduations onthe bar. Each positioning block 98 is pivotally mounted on itssupporting register block 96, the connection being made by means of pins120 and 121w'hich are fixed in the ears 122 carried by the registerblock 96 and which V plate after f frame when it is are pivotallyengaged by other ears 123 and 124 carried by the positioning block 98.Each of the pins is threaded throughout a portion of its length'to beengaged by a'micrometer screw v125 provided with a. dial 126 having'graduations which may be broughtv into register with an index mark 127formed onthe ear 123. The ear 123 is notched as shown at 128 andthemicrometer screw with its dial is located in this notch so that when itis rotated on the screw-threaded pin 120, itseDgageme'nt with theopposite parts of the ear 123 forces the positioning block 98in onedirect-ion or the other. This micrometer` adjustment may be used tocompensate for inaccuracies due to the stretching of the zinc a part ofa design of severallcolors has beenvprinted, for example, orl for otherpurposes where a After the adjustment has been made, the lock.- betightened to secure 98 in the ydesired ading members 119 may thepositioning block justed position with respect to the supportingregister block 96. y

To prevent the register bars 95 lfrom sagging, the carriage 80 isprovided withytwo tubular reinforcing' bars 130 which are fixed inbrackets 131 secured to the ends of the bars 95. The register blocks 96are provided at each end with other brackets 132 which are adapted toslide on the tubular bars when the register blocks are adjustedtransversely of the machine. n The carriage 80 also comprises a pair oflifting bars 135, each of which bis of angle bar form, having aninwardly directed horizontal ange 135% At their ends, the flanges 135aare cut away so l of the lifting .bars are permitted to engage notches136 extending downwardly from the top surfaces ofsupporting posts 137which.

are mounted in fixed positions on lthe side blocks 83 of the carriage 80at the front and rear sidesof the machine.- are adapted toAslideupwardly in the notches 136, without disengagement from the posts 137,for the purpose of elevating the `vacuum desired to move the vacuumframe. and the negative with respect'to Fig. 6, for thevpurpose thesurface of the sensitized plate 37. For( this purpose, the,vacuum frame60 .1s `provided on each side with a pairof lifting hooks 138 havingpivotal movement about-vertical axes and having their 'upper endsextended horizontally' and provided with rollers 138a which may beturned .to project over the flanges y135a of the lifting bars, as shownin .of permitting the vacuum frame 60 to be elevated when the liftingbars 135 are elevated by the mech- Danism hereinafter described. When 1tis desir'ed to remove the yacuum frame 60 from the carriage 80, theheads 138a hooks may be turned inwardly out of engageand then the lift-'their elevated positions,

vfine ad]ustment is desired. ,i

thaty the extremities 135"4 The lifting bars of the lifting which.normally overli\e the edges of the vacuum frame, as shown in Fig. 6,may be lifted upwardly out of engagement with the posts.137 and removedfrom the machine, to perllit the-vacuum frame 60 to be elevated andlremoved fram the carriage.

a Before describing the mechanism 'byA which the lifting bars 135 A ingbars,

the means for moving, the carriage 80 longitudinally of the are elevatedand held in v machine will be explained. The front and rear framemembers 31 bfthe machine have journaled therein two transverse shafts140 and 141 which are located inwardly from the end frame members 32, asshown in Fig. 1.`

The shaft has fixed thereon two sprocket gears. 142 located at the'frontand rear sides 'of the machine to be engaged by endless sprocket chains143. The sprocket chain 143 at the rear side of the machine extendsaround another sprocket gear 144 rotatably mounted on the rear end ofthe shaft l141 and the 4sprocket chain 143 at the front side of themachine extends around a sprocket, gear 144 `which isl rotatably mountedon the forward end of the shaft 141. v The forward end of the shaft 140is provided with a squared portion 140 adapted to be engaged by a crank145 and the chains 143 are connected to the center blocks 82 of thecarriage frames, as

shown at 146, so -thatwhen the shaft 141 is rotated by the crank 145,the movement of the chains serves to effect a movement of the carriage80. The o eration ofthe crank on the shaft 140 is uti izedonly formoving the carriage 80 toward the left as viewed in Figs. 1 and 2 andthe feeding movement of the carriage toward the right is brought aboutby certain mechanism operated by the shaft 141. The shaft 141 isoperatedby a lever 147 whichy is keyed on the outer endof the shaft. A dialv 148and a ratchet wheel 149 are supported byand ,Y

mounted for rotation on a sleeve 150 which is keyed in stationarypositon with respect to a fixed bracket 151 and which is rotatablyengaged bythe shaft141. The dial and the ratchet wheel are separated bya flange 152 which is formed on the sleeve 150, and the ratchet wheel isretained in position on the outer end of the sleeve by means of a plate153 secured tothe end of the` sleeve, as shown in Fig. 18. The motion ofthecrankl or lever 147 v is transmitted to the ratchet wheel149 by apawl 154 which is fixed on the lever, as shown inFig. 17. The reverserotation of the ratchet wheel is vented by another pawl or detent 155mounted on the dial 148 which is normally locked other by a lockinglever 158 which is threadnormally preed on the sleeve 150 on the innerside of the bracket 151 and on the inner side of a frame member 159which carries the longitudinal scale 160 by 'means of which thelongitudinal position of the carriage 80 is determined. The carriage 80is provided with a pointer 161 adapted to move in proximity to the scale160 and before the carriage 8O is adjusted longitudinally of themachine,Av the locking lever 158 is operated to release the clutchmembers 156 and 157, and the dial 148 is then rotated until the desiredgraduation thereon is brought into position opposite the graduation onthe stationary stop 163 which is carried by the lower end of the bracket151, this setting of the dial having been predetermined by reference tothe scale 160 and the pointer 161.v The locking lever 158 is thenoperated to lock the dial 148 in adjusted position and the stop 165adjacent the zero graduation on the dial 148 will then be locatedproperly to limit the throw of the crank or lever 147 at a pointcorresponding to the limit of desired movement of the ratchet wheel 149and the carriage 80.

The rotation of the shaft 141 by the operation of the crank 147 servesto effect a longitudinal movement of the carriage 80, toward the rightas viewed in Figs. 1 and 2, through the operation of pinions 170 whichare keyed on the shaft 141 at the front and rear ends thereof and whichmesh with rack-bars 171 mounted for movementlongitudinally of the frame30 and having connection with the carriage 80, as hereinafter described.The front and rear frame members 31 of the machine are provided on theirinner'` sides with shoulders 172 extending the full length thereof andhaving V-shaped longitudinal grooves 173 formed tlrerein, as shown, forexample, in

Fig. 18. Each rack bar 171 is provided on its inner side with a V-shapedprojection adapt'- ed to engage one of the V-shaped grooves 173, whileon its upper side each rack bar ls'pro- .3 vided with ratchet teeth 171blocated opposit-e the rack teeth 171a which mesh with the pinions 170.The rack bars- 171 are held in sliding engagement with the grooves 17 3by means of spring plates 174 secured to the frame members 31. by meanslof bolts 175, as shown particularly in Fig. 8. Each middle block 82 ofthe carriage 80 is provided with two pivotally mounted pawls 177 whichare normally pressed into engagement with the ratchet teeth 171b bymeans of leaf springs 178. The teeth-171b are spaced apart to correspondto the spacing of the graduations on vthe face of the'dial 148 and onepawl 177 of each pair is of greater length than the otlier, so that theextent to which the carriage 80 is moved depends upon which pawl 177 ofeach j pair is in engagement with the ratchet teeth of the adjacent rackbar 171 when the rack bar is moved by the operation of the crank 147.The pawls 177 are moved into and out of by transverse shafts 182 whichare connected thereto at the right hand end of the machine, as viewed inFig. 1, by bevel gears 183 and at the left hand end of the machine byworms 184a and worm wheels 184". The shafts 182 are operated by a crankor lever 185 fixed on a longitudinal shaft 186 which has a worm wheel187 keyed thereon near one end to mesh with aworm 188 fixed on theadjacent shaft 182 while the other end of the shaft 186 is connected tothe other shaft 182 by bevel gears 186:2 thus driven at both ends,thereby eliminating any possibility of their twisting under torsionalstress.

The position of the leverl The cam shafts 181 are 185 is indicated by astationary quadrant 189 the neutral position 190C, the twoshafts 181 arerotated to act-nate the cams 180 by which x the positions of the pawls177 are controlled. When the detents are elevated against the pressureof the springs 178, as illustrated in Fig. 12, the teeth of the pawls 177 are released from the ratchet teeth 171b on the rack bars 171, so thatthe carriage 8O may then be moved toward the left, as viewed in Fig. 1by the operation ofthe crank 145.

rfhe shafts 181 alsocontrol the operation of certain detent mechanismwhich is provided for locking the carriage 80 in position after it hasbeen shifted. This mechanism comprises a pair of longitudinallyextending toothed bars 191 one of which is mounted on the inner side -ofeach of thexlongitudinal frame members 31. These toothed bars haveaccurately machinedteeth which are adapted to be engaged by detents 192,two of which are mounted on each center block 82 of the carriage'80, thedetents being carried at the ends of leaf springs 193 which are securedto the carriage'blocks and which normally hold the-detents out ofengagement with the toothed bars. The detents 192 are actuated to engagethe toothed bars bycams 194 which 'are fixed on the shafts 181 adjacentthe cams 180. For convenience 4of adjustment, the two cams 194 at eachside of the machine are mounted on a sleeve 195-1which is fixed on theadjacentshaft 181 and which has an annular projection 195a at its middlei point, the opposite inclined surfaces ofy which are engaged by thecams 194 which arev secured in adjusted position by lock nuts 196, v

each cam being secured in position between 'two of these lock nuts, asshown in vided for each shaft'1'81 so that one detent of. each'pair willengage the adjacent toothed bar 191,.depending upon the position' of thelever 185 by which the angular positions of the shafts G181 arecontrolled. o T-he teeth of the detents 192. are so arranged that one ofthem will engage the adjacent toothed bar 191yat either a one-sixteenthor a one-eighth inch movement of the carriage 80, to corre.-

spond with the action of the awls 177 by* which the feeding movement othe carriage is effected through the motion ofthe rack bars 171. J

\ The angular movement of the shafts 181, elfectedby the actuation ofthe lever 185,1is also utilized to elevate the lifting .bars 135 of thecarriage 80. This lifting movement is effected by means of four cams198, one of which is splined on one of the shafts l181 beneath each ofthe side carriage' blocks 83 of the carriage 80. These cams are engagedon their peripheral surfaces by rollers 199 mounted to movelongitudinally of the shafts 'l 181when 'the carriage 80 is shifted,this movement of the cams being effected by their connectionv withcollars 203 which are rotatably surfaces .of the bars 135, coil springs202 may preferably be mounted on the plungers 200 mounted at the lowerends of plungers 200 which are slidably mounted in the carriage blocks83 and which carry at their upper ends enlarged heads 201 arranged tounderlie the ends of the lifting bars 135, as indicated in Fig. 8. Forthe purpose of maintaining the plungers 200 normally in contact with theetween the upper sides o the carriage blocks 83 andthe heads 201. Thecams 198 are engaged by the shafts 181 and which are rovided withannular grooves 204 adapte to receive the ends of .pins 205 which areslidably mounted in the carriage blocks 83 .and

. which are normally moved into engagement the carriage 80 to be shiftedfrom'one posiwith the grooves 204 by means ofvcoil-springs 206, as'shownparticularly in Fig. 7. The pins 205v have heads 207 which permitthem to be withdrawn when desired. When all of the cams'198 aresimultaneouslymctuated by the turning of the shafts 181, thelifting-bars 135 of thecarriage 80 are elevated and thev vacuum frame israised until all parts of the vacuum frame and partscarried thereby areout of engagement wit fthe surface of the sensitizedr plate 37, therebypermitting tion Ato another and permitting the vacuum frame to beshiftedin its position on the carriage without causing in]ury to thesurface of the sensitized plate. During the shifting movement of thevacuum frame 60 either on the bars 135 of the carriage 80 or @by reasonof the shifting movement of the carriage on the supporting frame, theweight of the vacuum frame 60 is supported by the Aydetachable liftingbars 135. When the lifting bars .135 are elevatedl by the cams theyremain in engagement with the Vposts-137 land the vacuum frame 60retains its connection with the i positioning blocks 98, because of thelength of the f ,Vacuum pin 99 and the lugs frame and the registerblocks 96 move together during the adjustment of thev vacluumy 'frametransversely ofthe machine at which time the vacuum frame is supportedby the hooks 138 having rollers 138l which travel on the lifting bars135. l

When the lever 185`is in the neutral position opposite the marker 190?on the'jquadrant 189, in which position the lever is illustrated in Fig..19, the lbngitudinalshafts 181 arein such positions that'the liftingbars 135 are elevated by' the cams 198, the carriage locking detents192,are out of engagement with the toothed bars 191, and the pawls 177101. Hence, the

are out ofen'g'agement with-the`ratchet teeth on the rackbars 171, sothat the carriage 80 can be returned to the starting point at theleft-hand end of the machine, as view in Fig.

1, by means of the crank 145 mounted on'the, outer end of the shaft 140.When the leverA he rack bars 171, but the carriage locking y can begivenha, feeding movement toward the right, as viewed in Fig.' 1, bythe'actuation of the lever 147. The feeding movement of the carriage 80takes place, throgh a predeten mined distance-according to the previoussetting of the dial 148 and its `sto 165. When the carriage 80 has beenshifte to the predetermined position,a full throw of the lever 185to-one of the extreme positions 190 or 190 will cause one of the detents192 toengage certain notches of the toothed bars 191,

thereby locking the carriage 80 positively 'at a certain graduationdepending upon the previQus setting of the dial, the position of thelever 185 opposite thel pointer 190EL corresponding to a one-eighth inchgraduation on the dial andtheposition 190 correspondin 4to aone-sixteenth inch setting onthe -dia The angular movement of the.shaftsl 181,by turning the lever 185 to either of the-posiltionsindicated by the pointers 190l or 190, also loperates to turn the cams198 sothat thc lifting bars 135 are free to move downwardly by gravity.and thereby lpermit the vacuum frame 60 to lower.' However, the liftingA bars are maintained in their elevated positions for a brief intervalafter the lever has been opera-ted to Kmove the detents 192 intoengagement with the toothed hars 191,

vacuum frame. 60 .and parts carried thereby' out of engagement with thesensitized sheet 37 for a sufiicient period of time to permit thedetents 192 to engage the toothed bars 191 and thereby effect a slightfinal adjustment of the carriage 80 without causing injury tothesensitized plate. The electromagnetic mechanism for holding fthelifting bars 135 in their elevated positions comprises a pair ofelectro-magnets 210 mounted at each end of each of the lifting bars 135.The

magnets 210 of each pair are mounted on the magnetizable arms 211 of ayoke-shaped core 212 which is secured on the upper surface of one of thecarriage blocks 83. Each pair of electro-magnets is provided with anarmature 213 mounted on an angular lever 214 and adapted to engage theextremities of the core members 211. The armature levers 214 are pivotedon supporting brackets 215 and their outer ends are provided withvertically adjustable contact screws 216 adapted to engage the undersides of the lifting bars 135. rlhe contact screws 216 are secured inadjusted position by set screws 217. The electromagnets 210 areconnected in series in an electric circuit 218, as shown in Fig. 26, andthe insulated wires of the electric circuit at one side of the machineare carried through the tubular reinforcing members 130 of lthe carriage80, as shown in Fig. 4, so that the connections to the magnets are-allcarried downwardly atthe rear side of the machine. --The circuit 218is'connected to a suitable source of Y electrical energy andtheactuation of the magnets 210 is controlled by a switch 220 mounted ina casing 221. f

.The switch 220 is operated by a lever 223 which serves also to controlthe connection of the air exhaust line to the vacuum frame. The lever223 is mounted on a shaft 224 which is j ournaled in bearings .carriedby the vend frame members 32 and a bracket 225 se'- cured to the endframe members, as shown in i Fig. 16. The inner end of the shaft 224' isf connected to operate a valve 226 which is connected in the suctionline 227 leading to the vacuum frame 60. A pinion 228 is fixed'on 'theshaft 224 between its bearings and this pinion meshes with rack teeth229 formed on the lower edge of a switch `operating plate 230 which ispivotally connected at 231 to a link 232 having a pivotal connection at233 with the handle 234 of the switch. 220. The

plate 230 is provided on its inner side with an ,overhangilig shoulder235 adapted to sli-de on a flange 236 which is formed on a bracket 237secured to the end frame of the machine. On its front side, the plate230 is provided with a ledge 238 above which is located a plate l239Secured to the bracket 237 above the plate 230 by cap screws 240,thereby holding the sliding plate 230 in position on the bracket 237.The movement of the plate 230 toward the right, as viewed in Fig. 19, islimited .by a

Stop pin 241iprojecting outwardly from the bracket. The plate-iz230 isfurther provided with an' upwardly extending arm 242 which, whenthelever 223 is in the vertical position, illustrated in Fig. 19, isadapted/to extend upwardly at one side of the longitudinal axis of movethe lever 223 to open the switch 220 Vbecause of the interference 4oftheprojection 244 on the hub of the lever 185 wit-h the upstanding arm 242on the plate 230. 1When the lever 185 is in either of the intermediatepositions 190b or 1901, the projection 244 on the lower end of the leveralso prevents the actuation of thelever 223 to open the switch 220, sothatr it is only after the lever 185 has been shifted to either .of theextremepositions 190a or 190 that the lever 223 may be operated to openthe switch V220 and thereby release the lifting bars 135 from themagnets 210.` When the lever 185 is in either of the extreme positions,the arm 242 on the plate 23() is permitted to pass beneath one of theinclined faces 245 on the hub, one of whichv is located on either sideof the projection 244, so that the operator may then move the lever 223-to open the switch 220 and simultaneously connect the air exhaustingmeans with the vac-uum'frame, so that the vacuum frame 60 is permittedto lower by gravity into contact with the sensitized plate 37,simultaneously with the actuation of the suction means so that when thevacuum frame engages the sensitized plate,.a

vacuum is at once created in the region be-v tween the vacuum frame andthe negative on the one hand, and the sensitized plate on the other,whereby the negative and the sensitized plate are drawn into closecontact with each l 223 takes place to permit 4and the negative to lowerin their upper position is the vacuum frame by gravity toward After thelifting bars the sensitized plate.

frame have been ele- 135 and the vacuum vated by operation of the lever185, theA operator may actuate the lever 223 to close the 'switch 220and energize the electro-magnets so that the maintenance of the liftingbars 135 insured before the lever 185 is again operated to turn the camshaftsV 181 into the positions which subsequently permit the liftingbars to be lowered when the magnets are .de-energized. f

Although one form of the invention has been shown and .described by wayof illustration, it will be understood that it may be constructed invarious other embodiments within the scope of the appended claims.

I claim:

1. The combination in a photo-composing machine, of a negative holdingframe, means for raising said frame and holding it in' an elevatedposition, means for operating said raising means to release saidframe,and additional means fyor holding said frame in said. elevated positionafter it has been released by said raising means.

2. The combinationin a photo-composing machine, offa negative carryingframe, means for raising said frame and holding it in an elevatedposition, mea'ns foroperating said raising means to release said frame,and electro-magnetic means for holding said frame in an elevatedposition afterit has been released by said raising means.

3. The combination in a photo-composing machine, of a bedplate forsupporting a sensitized plate, al negative carrying frame, means forraising said negative carrying frame away from said bedplate, means forrendei'in said raising means inoperative to hold said rame in itselevated position,`and means operative for holding said negativecarrying frame in an elevated position a'fter said raising means thasbeen rendered inoperative.`

4. The combination in a photo-composing machine, of means for supportinga sensitized plate, a negative carrying-frame, a member adapted toelevate said negative carrying frame, means adapted to engage saidmember to elevate said frame, vmeans for operating said elevating meansto release said carrying frame in its elevated position, and` additionalmeans acting on said member to hold said negative carryingframe in anelevated position after said memberhas been released by saidelevatingmeans.

5. The combination in a photo-composing machine, of means for supportingasensitized plate', avnegative carrying frame, means for elevating saidnegative carrying frame, means for moving said negative carrying frameover the surface of said sensitized plate after it has been elevatedtherefrom, cooperating means for releasing said elevating means andmeans operative \while said positioning means is in operation forholding said negative carrying frame in an elevated position.

6. The combination ina photo-composing machine, of means for supportinga sensitized plate, elevating said negative carrying frame, means formovingsaid negative carrying frame over the surface of said sensitizedplate after it has been elevated therefrom, cooperating meansforreleasing said elevating means and positioning said negative carryingframe with respect tosaid sensitized plate, and eleca negative carryingframe, means 'for tro-magnetic means cooperating with a part l of saidelevating means for holding said negative carrying frame in an elevatedposition rwhile said positioning means is operative.

7. The combination in a photo-composing machine,'of means for supportinga sensitized plate, a negative carrying frame, a member for supportingsaid negative carryin cam operated means for actuating said memp ber toraise said negative carrying frame away from said sensitized plate,means for adjusting saidfpnegative carrying frame parallel to thesurface of said sensitized plate while said negative carrying frame iselevated, means for releasing said cam-operating means and effecting apositioning of said negative carrying frame after it has been moved, andmeans cooperating with said member vwhile said positioning means isoperative for holding said negative carrying frame in an elevatedposition.

8. The combination in a photo-composing frame, c

machine, of meansfor supporting a sensitized lll tive supporting meansin an elevated posi- Y tion, and means for releasing said holding meansto permit 4saidlsupportin'g means to lower toward said sensitized plateand simultaneously to actuate said vsuction operated means to securecontact between said sensitized plate and said negative.

10. The combination in a photo-composing machine, of means forsupporting a sensitized v plate, a negative, a frame for carrying saidnegative, means for securing a close contact between vsaid negative andsaid plate, means for velevating said negative from said plate,

means for moving said negative carrying frame parallel to the surface ofsaid sensitized plate while it is elevated, means for positioning saidnegative carrying frame after it has been moved, additional means forholding said negative carrying frame in an elevated position while saidpositioning means is operative, and means for releasing said holdingmeans and actuating said contact .securing means.

11. The combination of a photo-composin machine, of means for supportinga sensitized plate, a negative, a frame for carrying said negative andsaid plate, means for securing a close contact between said negative andsaid plate, means for elevating said negative from said plate, means formoving said negative carrying frame parallel to the surface of saidsensitized plate while it is elevated, means for positioning saidnegative carrying frame after it has been moved, additional means forholding said negative carrying frame in an elevated position while saidpositioning means is operative, and means actuated by a single operatingmember for releasing said additional holding means and simultaneouslyactuating said contact securing means.

12. The combination in a photo-composing machine, of means forsupporting a sensitized plate, a negative carrying frame, meanscomprising a pair of lifting bars for elevating said frame, cam operatedmeans for elevating said lifting bars, and additional means cooperatingwith said lifting bars for holding them in an elevated position afterthey have been released by said cam operated means.

13. The combination in a photo-composing machine, of means forsupporting a sensitized plate, a' negative carrying frame, means formoving said frame away from said plate, means for moving said frameparallel to the surface of said plate, means for positioning saidnegative carrying frame after said last named movement, and means forpreventing the return of said negative carrying frame toward saidsensitized plate while said positioning means isin operation.

14. The combination in a photo-composing machine, of means forsupporting a sensitized plate, a negative carrying' frame, meanscomprising a lifting bar for elevating said frame, means for elevatingsaid lifting bar, and electro-magnetic means having a part engaging saidlifting bar for holding it in its elevated position after it has beenreleased by-said last named means.

15. The combination in a photo-composing machine, of means forsupporting a sensitized plate, a negative carrying frame, meanscomprising a pair of lifting bars for elevating said frame, cam operatedmeans engaging each end of each lifting bar for elevating said liftingbars away from said sensitized plate, and additional means engaging eachend of each of said lifting bars for holding them in said frame, camoperated means engaging.

each end of each lifting bar for elevating said lifting bars away fromsaid sensitized plate,

. and electromagnets having armatures extending beneath said liftingbars and adapted t0 hold said bars in their elevated positions when saidelectro-magnets are energized.

17. The combination in a photo-composing machine, of means forsupporting a sensitized plate, a negative carrying frame, electricallyactuated means for holding said negative carrying frame away from saidsensitized plate, suction operated means for securing Contact betweenthe negative vand said sensitized plate, means for Jactuating.. saidelectrically operated means, and means for actuating said suctionoperated means. f

18. The combination in a photo-composing machine, of means forsupporting a sensitized plate, a frame carrying a negative, means forsecuring close Contact between said negative and said sensitized plate,electrically actuated means for holding said negative carrying frame ina position removed from, said sensitized plate, and means forsimultaneously actuating said holding means to release said negativecarrying frame andl actuating said v contact securing means to securesaid close contact.

19. The combination in a photo-composing machine, of means forsupporting a sensitized plate, a negative, suction operated means forsecuring close contact between said negative and said sensitized plate,a valve for controlling said suction operated means, electricallyactuated means for holding said negative out of contact with saidsensitized plate, a svi tch for controlling said electrically actuatedmeans, and a common operating member for controlling the actuation ofsaid valve and said switch.

20. The combination in a photo-composing machine, of means forsupporting` a sensitized plate, a negative carrying frame, means forelevating said negative carrying frame from saidsensitized plate, alever for operating said elevating means, means for moving said negativecarrying frame parallel to the surface of said sensitized plate, meansactuated when said lever is operated to release the.

support of said negative carrying frame by said elevating means foreEecting a finalpositioning of said negative carrying frame after it hasbeen moved parallel to said sensitized plate, additional means forholding said negaoperation of one of said levers to be controlled by theactuation of the other of said levers.

21'. The combination in a photo-composing machine, of means forsupporting a sensitized plate, a negative carrying frame, means-forelevating said negative carryin frame from said sensitized plate, alever or-operating s aid elevating means, means for moving saidnegative`r carrying frame parallel to the surface of. Said sensitizedplate, means actuated when said lever is operated to releasethe sup.-port of said negative carrying frame bysaid elevating means foreffecting a final positioning of said negative carrying frame after ithas been moved `parallel to said sensitized plate, additional means forholdingsaid negative carryingy frame in an elevated position while saidpositioning means is in operation, a lever for controlling the operationof said additional means, and means for preventing the actuation of saidlast named lever to permit said negative carrying frame to move towardsaid sensitized plate until said first named lever has been actuated toeffect the operation of said positioning means.

22. The combination in a photo-composing machine, of means forsupporting a sensitized plate, a negative carrying frame, means forpositioning said negative carrying frame with respect to said sensitizedplate, means for holding said'negative carrying frame away .from saidsensitized plate while said positioning means is in operation, means forre' leasing said holding means, and means for 'preventing the actuationof `said releasing means until said positioning means has been operated.t f

23. The combination in a photo-composing l machine, of means-forsupporting a sensitized-plate, a negative carrying frame, meansl forpositioning said negative carrying frame. with respect to saidsensitized plate, means comprising a lever for operating said positionmgmeans, means for holding said negative carrylng frame away from saldsensitized plate while sald posltionlng meansisv in operation, meanscomprising a lever for.-

. controlling the operation of said holding means, an intermediatemember adapted to be actuated by the movement'pf said lastl named leverto effect the release .of said negative carryin frameby said holdingmeans,

and means ying normally in the path of movement ,of said intermediatemember and arranged to permit the actuation` of said intermediate memberby said second named' said plate, and .additional electro-magnetic meansfor controlling the return movement of said frame toward said plateholding means. L

25. The combination in aphoto-composing machine, of means for supportinga sensitized plate in a horizontal position, a negative holding framefor holding a negative'in a plane parallel to said sensitized plate,means for effecting. relative separation of said negative yholding frameand said plate supporting means for permitting relative movement thereofin a plane parallel to the surface of said plate, and electro-magneticmeans operative after said relative separation hastaken place forcontrolling the return movement whereby said sensitized plate -and saidnegative are brought intocontact.

26. The cmbination in a photo-composing v machine, of means forsupportingv al sensitized plate, a negative moving structure comprisingoppositely disposed movable guiding members, a pin extending upwardlyfrom one of said guiding membersfa notched member carried by the otherof said guiding members, and a negative carrying vframe v having a holeto be engaged by said pin and havinga lug to engage the notch in said ynotched member.

27. The combination in a photo-composing machine, of meansfor supportinga sensitized plate, a negative moving structure comprising oppositelydisposed movable guiding members, a pin extending upwardly from one ofsald guidinglmembers, a notched meinber carried by the other of saidguiding members, a negative carrying frame having va hole to be'engagedby said pin and having a lug to engage the notch in said notched member,and meansfor elevating said negative carrying frame out of engagementwith 'the sensitized plate Without disengaging said pin from saidaperture and without disengaging said. lug from said notch.

T. KOPPE.

